Date of Award

January 2015

Degree Type


Degree Name

Master of Science (MS)


Engineering Technology

First Advisor

Qingyou Han

Committee Member 1

Qingyou Han

Committee Member 2

Duane D Dunlap

Committee Member 3

Richard M French


The microstructure and microhardness of the anodic alumina oxide film, created by anodization, were analyzed based on the data obtained through FE-SEM images. The microhardness of AAO film deteriorated with increasing electrolyte temperature. The porosity likewise increased with temperature. The observed microstructure including the size of oxide grains and wall thickness enclosing oxide grains of AAO film led to morphological characteristics. These results were caused by the effect of change in the electrolyte temperature on the formation AAO film. Scanning Electron Macrographs provided the microstructures, composed of increased oxide grain size and decreased wall thickness of pores by increasing electrolyte temperature, created smooth morphological features on the surface. Microhardness on the oxide film surface anodized at lower electrolyte temperature has a high value while microhardness decreased with increasing electrolyte temperature. Toughness on AAO film created at low temperature was also higher than AAO film anodized at high temperature through surface cracks, resulting from use of a Rockwell hardness indenter, occurred.